根据动态交通分配模型中广泛使用的路段行程时间与路段车流量具有二次函数关系的模型,在已知路段输入流的条件下,给出了路段输出流的一般表达式和路段行程时间的递归表达式.在路段车流满足先进先出的条件下,结合任意时刻的车流量表达式和线性路段行程时间模型得出输出流与输入流的关系式,导出此时刻的路段车流量表达式,从而给出了更明确的关于路段行程时间的表达式;同时结合道路交通流调查数据,对一些实例进行了数值仿真,所得结果与实际相符.
The generic expression of outflows and the recursive expression of link travel time were presented when the condition of the inflows and the quadratic link travel time were known. On the assumption that traffic flow satisfies the rule of first in and first out (FIFO), the relational expression between the outflows and the inflows was given by the expression of traffic flow and the quadratic link travel time model. A traffic flow expression and a kind of more clear solution of quadratic link travel time were also presented. According to the conclusion presented, the expressions were simulated based on the real traffic investigation data. The result of simulation shows accordance with the real traffic flow status.